Sign support frame



FIG. 1 is a perspective view of a sign support frame of my new design;

FIG. 2 is a side elevational view thereof, the opposite side being a mirror image thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an enlarged end elevational view thereof, the opposite end being a mirror image thereof;

FIG. 6 is an enlarged sectional view taken along line 6—6 of FIG. 2; and,

FIG. 7 is an enlarged sectional view taken along line 7—7 of FIG. 5. 

The ornamental design for a sign support frame, as shown and described. 